Make `<NModal />` Draggable

[richwxd]

This function solves the problem (这个功能解决的问题)

As we know, multiple frameworks has good features for some scene, such as drag & drop a modal by clicking title, making max size in a frame. Could naiveui support them too?

Expected API (期望的 API)

Please see avuejs modal as a sample.

[07akioni]

Draggable: May be possible if scrolling is disabled. Fullscreen: May be possible but not planned yet.

[ue360]

啥时候能加上这个功能不？迫切需要

[07akioni]

啥时候能加上这个功能不？迫切需要

不在短期计划中，建议不要等这个

Not planned in short term

[liu-xinhui]

迫切需要这个功能，因为modal会遮住后面的内容，有些客户需要把dialog拖动其他位置，查看父级内容

[ForeverSun]

关注中

[maddenBoy]

+1

[peter-brennan]

+1

[jahnli]

duplicate https://github.com/tusen-ai/naive-ui/issues/2152